10 Maintenance and Inspection
10 - 2
NX-series Safety Control Unit User’s Manual (Z930)
10-1 Cleaning and Maintenance
Clean the Safety Control Units regularly as described below in order to keep them in optimal operating
condition.
• Wipe the network over with a soft, dry cloth when doing daily cleaning.
• If dirt remains even after wiping with a soft, dry cloth, wipe over with a cloth that has been wet with a
sufficiently diluted detergent (2%) and wrung dry.
• A smudge may remain on the Units from gum, vinyl, or tape that was left on for a long time. Remove
the smudge when cleaning.
Precautions for Correct Use
• Never use volatile solvents, such as paint thinner, benzene, or chemical wipes.
• Do not touch the NX bus connector.
Although the major components in Safety Control Units have an extremely long life time, they can dete-
riorate under improper environmental conditions. Periodic inspections are thus required.
Inspection is recommended at least once every six months to a year, but more frequent inspections will
be necessary in adverse environments.
Take immediate steps to correct the situation if any of the conditions in the following table are not met.
• Make sure that the Safety Control Units are used within the ranges of specifications.
• Make sure that the Safety Control Units are mounted and wired correctly.
• To maintain the operating reliability of the safety functions at a consistent level, diagnose the safety
functions.
• Use the error log to check whether non-fatal errors have occurred.
10-1-1 Cleaning
10-1-2 Periodic Inspections
Periodic Inspection Points
No. Item Inspection Criteria Corrective action
1 External power
supplies
Measure the power supply voltage
at the terminal blocks, and make
sure that they are within the criteria
voltage.
The voltage must be
within the power supply
voltage range.
Use a voltage tester to check the
power supply at the terminals. Take
necessary steps to bring voltage of
the supplied power to within the
power supply voltage range.
2 I/O power sup-
plies
Measure the power supply voltages
at the input and output terminal
blocks, and make sure that they
are within the criteria voltage.
The voltages must be
within the I/O specifica-
tions for each NX Unit.
Use a voltage tester to check the
power supply at the terminals. Take
necessary steps to bring voltage of
the I/O power supplies to within the
I/O specifications of each Unit.
To Next Page
Loading...
General
